I have what I call a jade plant (inside), about 2 foot tall.
The past month it has gotten real weak and droopy. I'm not
sure what to do for it. It was a beautiful plant.

Jade plants do well in a nice sunny window with a thorough watering when the soil is dry. If the light is too low and it's not getting water, enough to we the entire root-ball, leaves can drop and the stems will be soft and weak. Over-watering can also cause leaves to fall, weak & mushy stems and eventually root-rot. Check the roots for rot, if they ok, it may be that it just needs a good watering.